Align generated resource names with GEP 1762

[michaelvl]

Summary

GEP 1762 states (MUST):

MUST label all generated resources (Service, Deployment, etc) with gateway.networking.k8s.io/metadata.name: my-gateway (where my-gateway is the name of the Gateway resource).
MUST name all generated resources my-gateway-example (-). This is not simply NAME to reduce the chance of conflicts with existing resources.

Motivation

This approach is already being seen with Istio and may improve interoperability.

Note, special concern should be taken with cluster-scoped resource. The current approach of adding namespace to combined name should be retained.

Proposal

Naming as suggested in GEP 1762